We present high time-resolution spectroscopy of the eclipsing cataclysmic variable SDSSJ143317.78+101123.3 obtained with QUCAM2, a high-speed/low-noise electron-multiplying CCD camera. Littlefair et al. measured the mass of the secondary star in SDSSJ143317.78+101123.3 using a light-curve fitting technique and obtained a value of M2=0.060+/-0.003 Msun, making it one of the three first bona-fide detections of a brown-dwarf mass donor in a cataclysmic variable. In this paper we present a dynamical measurement supporting this important result. We measured the radial-velocity semi-amplitude of the white dwarf from the motion of the wings of the Halpha emission line and obtained a figure of K1=34+/-4 km/s, in excellent agreement with the value of K1=35+/-2 km/s predicted by Littlefair et al.'s model.
@article{arxiv.0905.2295,
title = {Radial-velocity study of the post-period minimum cataclysmic variable SDSSJ143317.78+101123.3 with an electron-multiplying CCD},
author = {S. M. Tulloch and P. Rodriguez-Gil and V. S. Dhillon},
journal= {arXiv preprint arXiv:0905.2295},
year = {2015}
}
Comments
5 pages, 6 figures, accepted for publication in MNRAS Letters